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71f8548ea4
The initial port of ZFS to Linux required a way to identify virtual memory to make IO to virtual memory backed slabs work, so kmem_virt() was created. Linux 2.6.25 introduced is_vmalloc_addr(), which is logically equivalent to kmem_virt(). Support for kernels before 2.6.26 was later dropped and more recently, support for kernels before Linux 2.6.32 has been dropped. We retire kmem_virt() in favor of is_vmalloc_addr() to cleanup the code. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>